I have the Neil Jones sizer and seater (both inline and threaded versions) and Redding Competition seater. The Neil Jones is a true custom die. You have to send him a couple of thrice fired, neck sized only cases and all of the dimensions fit your chamber precisely. I recommend his FL sizing die.
As for the Neil Jones seaters, I have found no difference in runout between the Neil Jones seating dies and the Redding Competition seater, so I would save my money and buy a Redding or maybe save some more money and buy the Forster micrometer seater, which I hear is as good as the Redding but cheaper.